Emphasis on "tend to"

Why is it that "conservatives" tend to

• believe in god
• be pro-gun
• be anti-gay
• be anti-immigration
• be anti-government
• be against "illicit" drugs
• etc

And "liberals" tend to

• be in favor of government-based social welfare
• be in favor of government programs
• be open to lgbtq rights
• be ok with "illicit" drug use
• etc

Why do "atheists" tend to be "liberal"?

I mean, I get some of the platform groupings, but some are weird. Like distrust of government would naturally lead you against government-based programs. And certain religious views lead to stances against abortion or gay rights. But it isn't clear to me how those all fit together. For example: being against government in general, but pro-military seem like antagonistic stances to take, imo.

Likewise with typical "liberal" platform things: why is a liberal platform more in favor of government welfare programs? Is it the secular nature of modern democratic governments? Why would a liberal point of view also tend towards atheism? I don't quite understand how those two are bound.

Mind you, this is more of a test post into this community than anything else. I kinda answered some of my own questions just by typing it out.